feat(GRO-1427): add buffer rules CRUD — enums, table, routes

Re-implement lost commit from worktree cleanup. PR #12 already has
UAT_PLAYBOOK + factories fix; add all missing core implementation:
- Add petSizeCategoryEnum/coatTypeEnum to schema
- Add bufferRules table with service FK + unique constraint
- Add defaultBufferMinutes column to services table
- Change pets.coatType/petSizeCategory text columns to use enums
- Add routes/buffer-rules.ts: GET/POST/PATCH/DELETE, manager role guard
- Register /api/buffer-rules in index.ts
- Update services.ts PATCH to accept defaultBufferMinutes
- Update pets.ts POST/PATCH to accept sizeCategory/coatType
- Cast coatType/petSizeCategory in book.ts insert to match new enums
- Add 0031_buffer_rules.sql migration
- Fix factories.ts buildService to include defaultBufferMinutes: null

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packages/db/migrations/0031_buffer_rules.sql

@@ -0,0 +1,31 @@
+-- Migration: 0031_buffer_rules.sql
+-- Buffer rules CRUD: pet size/coat enums, bufferRules table, services.defaultBufferMinutes
+
+-- ─── Enums ───────────────────────────────────────────────────────────────────
+
+CREATE TYPE "pet_size_category" AS ENUM ('small', 'medium', 'large', 'xlarge');
+CREATE TYPE "coat_type" AS ENUM ('smooth', 'double', 'wire', 'curly', 'long', 'hairless');
+
+-- ─── Alter pets columns to use new enums ─────────────────────────────────────
+
+ALTER TABLE "pets" ALTER COLUMN "coat_type" TYPE "coat_type" USING "coat_type"::text::"coat_type";
+ALTER TABLE "pets" ALTER COLUMN "pet_size_category" TYPE "pet_size_category" USING "pet_size_category"::text::"pet_size_category";
+
+-- ─── Services: add defaultBufferMinutes ───────────────────────────────────────
+
+ALTER TABLE "services" ADD COLUMN "default_buffer_minutes" integer;
+
+-- ─── Buffer Rules table ───────────────────────────────────────────────────────
+
+CREATE TABLE "buffer_rules" (
+  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  "service_id" uuid NOT NULL REFERENCES "services"("id") ON DELETE CASCADE,
+  "size_category" "pet_size_category",
+  "coat_type" "coat_type",
+  "buffer_minutes" integer NOT NULL,
+  "created_at" timestamp NOT NULL DEFAULT now(),
+  "updated_at" timestamp NOT NULL DEFAULT now(),
+  CONSTRAINT "uq_buffer_rules_service_size_coat" UNIQUE ("service_id", "size_category", "coat_type")
+);
+
+CREATE INDEX "idx_buffer_rules_service_id" ON "buffer_rules"("service_id");

packages/db/src/factories.ts

@@ -121,6 +121,7 @@ export function buildService(overrides: Partial<ServiceRow> = {}): ServiceRow {
     description: "A grooming service",
     basePriceCents: 6500,
     durationMinutes: 60,
+    defaultBufferMinutes: null,
     active: true,
     createdAt: new Date("2025-01-01T00:00:00Z"),
     updatedAt: new Date("2025-01-01T00:00:00Z"),

packages/db/src/schema.ts

@@ -48,6 +48,22 @@ export const clientStatusEnum = pgEnum("client_status", [
   "disabled",
 ]);
 
+export const petSizeCategoryEnum = pgEnum("pet_size_category", [
+  "small",
+  "medium",
+  "large",
+  "xlarge",
+]);
+
+export const coatTypeEnum = pgEnum("coat_type", [
+  "smooth",
+  "double",
+  "wire",
+  "curly",
+  "long",
+  "hairless",
+]);
+
 // ─── Better-Auth Tables ──────────────────────────────────────────────────────
 
 export const user = pgTable("user", {
@@ -142,8 +158,8 @@ export const pets = pgTable(
     cutStyle: text("cut_style"),
     shampooPreference: text("shampoo_preference"),
     specialCareNotes: text("special_care_notes"),
-    coatType: text("coat_type"),
-    petSizeCategory: text("pet_size_category"),
+    coatType: coatTypeEnum("coat_type"),
+    petSizeCategory: petSizeCategoryEnum("pet_size_category"),
     customFields: jsonb("custom_fields").$type<Record<string, string>>().notNull().default({}),
     photoKey: text("photo_key"),
     photoUploadedAt: timestamp("photo_uploaded_at"),
@@ -160,11 +176,34 @@ export const services = pgTable("services", {
   description: text("description"),
   basePriceCents: integer("base_price_cents").notNull(),
   durationMinutes: integer("duration_minutes").notNull(),
+  defaultBufferMinutes: integer("default_buffer_minutes"),
   active: boolean("active").notNull().default(true),
   createdAt: timestamp("created_at").notNull().defaultNow(),
   updatedAt: timestamp("updated_at").notNull().defaultNow(),
 });
 
+export const bufferRules = pgTable(
+  "buffer_rules",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    serviceId: uuid("service_id")
+      .notNull()
+      .references(() => services.id, { onDelete: "cascade" }),
+    sizeCategory: petSizeCategoryEnum("size_category"),
+    coatType: coatTypeEnum("coat_type"),
+    bufferMinutes: integer("buffer_minutes").notNull(),
+    createdAt: timestamp("created_at").notNull().defaultNow(),
+    updatedAt: timestamp("updated_at").notNull().defaultNow(),
+  },
+  (t) => [
+    unique("uq_buffer_rules_service_size_coat").on(
+      t.serviceId,
+      t.sizeCategory,
+      t.coatType
+    ),
+  ]
+);
+
 export const staff = pgTable("staff", {
   id: uuid("id").primaryKey().defaultRandom(),
   name: text("name").notNull(),